EXPONENTIAL TRICHOTOMY AND ROUGHNESS

ConsiderthesystemwhereAfR-R"x"isacontinuousnxnmatrixandxCR".LetX(l)bethefundamentalmatrixof(l)withX(0)=I.Definition1Thesystem(1)issaidtohaveanexponentialtricholoTll.yif.thereexistlinearprojectionsPandQsuchthatandconstantsKZ1,or>0,fi21suchthatanda.aarecall…     

PERSISTENCE AND GLOBAL STABILITY FOR TWO-SPECIES NONAUTONOMOUS PREDATOR-PREY SYSTEM WITH DIFFUSION AND TIME DELAY

In this paper, a non-autonomous predator-prey model with diffusion andcontinuous time delay is studied, where the prey can diffuse between two pat-ches of a heterogeneous environment with barriers between patches, but for thepredator, the diffusion does not involve a barrier between patches, further itis assumed that all the parameters are time-dependent. It is shown that thesystem can be made persistent under some appropriate conditions. Moreover,sufficient conditions that guarantee the existence of a unique periodic solutionwhich is globally asymptotic stable are derived.     

CHARACTERISTIC EXPONENTS FOR SECONDORDER PERIODIC LINEAR DIFFERENTIAL EQUATION

1IntroductionandMainResultsItiswellknownthatwhenp'--4q>0,secondorderautonomoussystemhastwocharacteristicexponentsfsothefollowingpropositionsareobvious.Proposition1Assumeq<0,then(1.1)hastwocharacteristicexponentswithoppositesigns.Proposition2Assumeq>0andp'…     

具有功能性反应和时滞的扩散捕食-食饵系统

考虑具有功能性反应和时滞的扩散捕食-食饵系统，其中食饵连两个斑块间具有一定的扩散系数，捕食者可以两个斑块中任意走动，我们讨论了系统的一致持久性和周期解的存在性及全局吸引性．     

STUDY ON THE THREE-SPECIES ALMOST PERIODIC MODEL WITH THE TYPE II FUNCTIONAL RESPONSE

By using Lyapunov function and differential inequality, sufficient conditions for the existence of global asymptotical stable almost periodic solution of the three-species almost periodic modei with the type II functional response are obtained.     

捕食者具有阶段结构Holling II类功能性反应的捕食模型

利用重合度理论中的延拓定理讨论了捕食者具有阶段结构Holling II类功能性反应的捕食模型的正周期解的存在性,得到了保证周期解存在的充分性条件,推广了已知的相关结果. 同时通过构造Lyapunov函数得到了保证周期解稳定性的充分性条件.     

一类具有功能性反应的中立型捕-食系统全局正周期解的存在性

首次研究一类具有HollingII型功能性反应中立型捕食者-食饵系统(即Rosenzweig-MacArthur模型),通过发展一些分析技巧,利用重合度理论中的延拓定理讨论了其全局正周期解的存在性,得到了保证周期解存在的充分条件. 最后举例说明该文定理条件是可行的.     

ON THE ALMOST PERIODIC SOLUTIONS OF HIGHER DIMENSIONAL NONAUTONOMOUS SYSTEMS

By means of the properties of almost periodic system and Lyapunov function, we give some criteria which guarantee the existence and uniqueness and stability of almost periodic solutions of higher dimensional nonautonomous system. The result is more convenient and effective than the related result in[1].     

中立型标量积分微分方程的周期解

本文考虑中立型标量方程x′(t)=a(t)x(t)+∫     

A REMARK ON THE CONCEPT OF TOPOLOGICAL EQUIVALENCE

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